If the surveyor without further inquiry rejects them because they belong to a society which he does not like, that may be an exhibition of ecclesiastical zeal, but it is not the science of surveying.
Whatever he may think of them, as a surveyor he has no right to ignore them.

He is surveying "his district".

There are in it so many persons of various religious belief, amongst them his own converts and these Christians of the opposite party.

He perhaps refuses to recognise the latter as Christians; but they are undoubtedly neither Moslems nor Confucianists, nor Buddhists, nor Hindoos, nor do they belong to any of the non-Christian religions.

He cannot ignore them.